Of the 788 Comcast subscribers who participated in the study, 491, or
62 percent, had their connections blocked. At Cox, 82 out of 151
subscribers, or 54 percent, were blocked, according to Krishna Gummadi
at the Max Planck Institute for Software Systems in Saarbruecken,
Germany.

The difference: While Comcast didn't tell its subscribers their Internet access was getting interfered with -- which is mostly what got the FCC so upset earlier this year -- Cox mentions it in their subscriber agreement. (Not that anyone reads those.) AP:

At least since 2006, Cox's subscriber agreement has noted that the
company engages in "protocol filtering," which means that it treats
different types of Internet traffic, like Web surfing, e-mail and
file-sharing, differently.

"To ensure the best possible online
experience for our customers, Cox actively manages network traffic
through a variety of methods including traffic prioritization and
protocol filtering," the company said it a written statement.